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Chapter 5 Specifications

Reliability Specifications

54 LTO-5 Tape Drive User’s Guide

Mean Time Between

Failures

• The mean time between failures (MTBF) for the internal drive is

specified at 250,000 hours minimum. This specification includes all

power-on and operational time but excludes maintenance periods.

Operational time is assumed to be 100% of the power-on time.

Operational time is the time the tape is loaded.

The MTBF for the tabletop drive power supply is 50,000 hours with the

unit operated at full load and 25°C.

Note: The MTBF rating does not represent any particular drive, but is

derived from a large database of test samples. Actual rates may

vary from unit to unit.

Mean Time to Replace The mean time to replace (MTTR) is the average time required by a

qualified service technician to diagnose a defective drive and to install a

replacement drive. The MTTR for LTO products is less than 0.5 hour (30

minutes).

The LTO drives are field-replaceable units. If a problem occurs with a

subassembly or component in the drive, you should replace the entire

unit. Return the drive to the factory in its original packaging. Contact

your distributor, dealer, your computer system company or your sales

representative to arrange the return.

Mean time between

failures (MTBF)

250,000 hours MTBF at 100% duty cycle:

power applied and tape moving

continuously

(tabletop drive; 50,000 hours at full load and

25°C)

Mean time to replace

(MTTR)

Less than 30 minutes

Nonrecoverable error

rate

Less than 1 in 10

bits

Specification Description

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Quantum TC-L53FN-AR Guía de usuario Pagina 68